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- Title
Combustion of microalgae Nannochloropsis oculata biomass: cellular macromolecular and mineralogical content changes during thermal decomposition.
- Authors
Sukarni, Sukarni; Yanuhar, Uun; Wardana, I. N. G.; Sudjito, Sudjito; Hamidi, Nurkholis; Wijayanti, Widya; Wibisono, Yusuf; Sumarli, Sumarli; Nauri, I. M.; Suryanto, Heru
- Abstract
The cellular macromolecular and mineralogical content changes during the combustion of Nannochloropsis oculata biomass have been investigated. A Fourier transform infrared spectroscopy (FTIR) analyzer was used to investigate the cellular macromolecular content changes of biomass at every stage of decomposition during heating to 1200 °C. From ambient temperatures to 190 °C, similar spectra were obtained, indicating relatively little change in the chemical structure of the biomass material. Changes in the spectra are very noticeable from 190 to 1200 °C. The combustion process begins with thermal cracking of the ?OH groups of silanol that escape together with moisture at temperatures up to 190 °C. Subsequent temperature increase decreased intensity of the spectrum, indicating thermal degradation of the organic compounds derived from lipids, proteins, and carbohydrates. These processes occur up to 800 °C. The X-ray diffraction (XRD) results showed that the mineral constituents of biomass degraded during the combustion process, and a portion reacted to form new compounds such as melilite (Ca6Na2O15Si4). The SEM images show a morphological distinction between biomass and its residue at 1200 °C, due to the decomposition and rearrangement of the mineral content during heating. Fragmentation of the samples also occurred during heating, characterized by more uniform residue at 1200 °C.
- Subjects
MICROALGAE; BIOMASS; MACROMOLECULAR dynamics; MINERALOGICAL research; FOURIER transform infrared spectroscopy; COMBUSTION
- Publication
Songklanakarin Journal of Science & Technology, 2018, Vol 40, Issue 6, p1456
- ISSN
0125-3395
- Publication type
Article